Final answer:
Motion smear causes objects on the sides to appear blurred and distorted as speed increases, due to limitations in our motion perception and visual processing.
Step-by-step explanation:
When a person's speed increases, objects on the sides appear blurred and distorted due to Motion smear. Motion smear occurs because, as objects move quickly past us, they spend less time in our visual field and our eyes and brain do not have enough time to process the images clearly. This phenomenon is not related to visual acuity, which refers to the clarity of vision, or peripheral vision, which is our ability to see objects out of the corner of our eyes without turning our heads. However, it is directly connected to our motion perception, which is how we interpret the movement of objects, and how reference frames affect the visual processing. Myopia is an example of how objects at different distances can appear out of focus due to refractive issues in the eye, but this is different from the effect of motion smear.